public function getConfigurableOptions()
{
$resolver = new OptionsResolver();
$resolver->setDefaults(['config' => null, 'config_file' => null, 'fixers' => [], 'level' => null, 'verbose' => true]);
$resolver->addAllowedTypes('config', ['null', 'string']);
$resolver->addAllowedTypes('config_file', ['null', 'string']);
$resolver->addAllowedTypes('fixers', ['array']);
$resolver->addAllowedTypes('level', ['null', 'string']);
$resolver->addAllowedTypes('verbose', ['bool']);
return $resolver;
}